CN113882803A

CN113882803A - Chain wheel type ground auger with speed change structure

Info

Publication number: CN113882803A
Application number: CN202111229707.6A
Authority: CN
Inventors: 李高产
Original assignee: Shandong Dongyang Garden Machinery Co ltd
Current assignee: Shandong Dongyang Garden Machinery Co ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-01-04

Abstract

The invention discloses a chain wheel type ground drill with a speed change structure, which comprises a frame, a gasoline engine body and a sliding frame, wherein the sliding frame is arranged on the front surface of the frame, the gasoline engine body is arranged at the top of the sliding frame, a connecting frame is arranged at the top of the inner wall of the frame, a supporting rod is arranged at the bottom of the inner wall of the frame, a connecting rod is arranged on the inner wall of the frame, and the connecting rod is positioned above the supporting rod. According to the invention, through the arrangement of the frame, the supporting seat, the universal wheel, the accelerator control handle, the base and the limiting pyramid, the inclination angle of the device is adjusted through the accelerator control handle, so that the device is convenient to move integrally, convenience is provided for the use of the device, and in the installation and use process, the stability of the device in the use process is increased under the auxiliary supporting effect of the anti-skidding seat, so that the accelerator control handle is convenient to control the drilling work of the device, and a stable supporting structure is provided for the use of the device through the matching between the supporting seat and the frame.

Description

Chain wheel type ground auger with speed change structure

Technical Field

The invention relates to the technical field of ground drilling equipment, in particular to a chain wheel type ground drill with a speed change structure.

Background

In current forestry planting work, when transplanting the sapling time of returning affairs trees and planting, need open litter work on soil, traditional mode is mostly the manual work and excavates, and the efficiency of manual work excavation is lower, and intensity of labour is big, and the practicality is not enough, therefore the appearance of the ground of different grade type bores the device, provides very big facility for the excavation work, nevertheless current partial ground bores the device and still has certain not enough when using, is difficult to satisfy in the user demand.

The chain wheel type ground auger in the prior art has the defects that:

1. the reference CN106639862B discloses a hand-held ground drill, which comprises a machine head and a working head, wherein the machine head comprises a casing, a handle arranged on the casing, and a motor and a transmission mechanism arranged in the casing, the transmission mechanism comprises an output shaft, the working head is connected to the output shaft, the motor drives the working head to rotate through the transmission mechanism, and the transmission mechanism comprises a speed regulating assembly for regulating the rotation speed of the output shaft. The handheld ground drill provided by the invention improves the transmission mechanism of the existing handheld ground drill, the speed regulating assembly is additionally arranged, the rotating speed of the output shaft is changed through the speed regulating assembly, so that the rotating speed of the working head is adjusted, the rotating speed of the working head can be adjusted according to specific operation conditions, and the universality of the handheld ground drill is effectively improved. In addition, the rotating speed of the working head is matched with the specific operation condition, the situation that the working head or a motor or a transmission mechanism is damaged due to the fact that the rotating speed is not matched with the operation condition can be avoided, and the service life of each component is effectively guaranteed;

2. reference CN109220081A discloses a ground drilling earth boring machine and a ground drilling earth boring method, which includes a support frame, a cylinder assembly and a support platform, wherein the support platform is used for bearing the ground drilling assembly, a driving motor and a relay. The ground drill assembly comprises a drill shaft and a drill bit, and the driving motor is used for driving the drill shaft and the drill bit to rotate. The air cylinder component drives the supporting platform and the ground drill component to move along the axis direction of the drill shaft. The earth boring digging machine also comprises a velometer and a single chip microcomputer, wherein the velometer measures the running speed of the drill bit along the axial direction of the drill spindle. The single chip microcomputer can control the output power of the driving motor through the relay according to the running speed. In the use process, the running speed of the drill bit along the axial direction of the drill shaft is measured through the velocimeter, if the running speed of the drill bit is too low, the drill bit is judged to touch a stone block or a harder soil layer, at the moment, the singlechip controls the driving motor to stop working through the relay, so that the drill bit of the ground drill is prevented from continuously colliding with the stone block, the drill bit is easy to wear, in the patent, when the device is used, the use of the drill bit structure lacks a convenient replacement effect, and the application range is limited;

3. when the ground drill in the prior art is used, the ground drill is lack of a stable lifting structure, and when the ground drill is used for drilling, the drilling speed is lack of an applicable adjusting function, so that the working efficiency of the device is influenced.

Disclosure of Invention

The present invention is directed to a chain wheel type ground auger with a speed changing structure to solve the problems of the background art.

In order to achieve the purpose, the invention provides the following technical scheme that the chain wheel type ground drill with the speed change structure comprises a frame, a gasoline engine body and a sliding frame, wherein the sliding frame is arranged on the front side of the frame, and the gasoline engine body is arranged at the top of the sliding frame;

the top of the inner wall of the frame is provided with a connecting frame, the bottom of the inner wall of the frame is provided with a supporting rod, the inner wall of the frame is provided with a connecting rod, and the connecting rod is positioned above the supporting rod;

the bottom of frame both sides is provided with the supporting seat, the outside of supporting seat is connected with the universal wheel, the antiskid seat is installed to the front end of supporting seat, the back of frame is provided with throttle control handle, and throttle control handle's front passes through circuit assembly and connects in the surface of gasoline engine body.

Preferably, the output end of the gasoline engine body is provided with a connecting rod, the outer surface of the connecting rod is sleeved with a connecting pin, the bottom of the connecting pin is connected with a drill bit assembly, and the outer surface of the connecting pin is in threaded through connection with a fixing bolt.

Preferably, the front surfaces of the connecting frame and the connecting rod are provided with rotating seats, the inner wall of each rotating seat is provided with a transmission rod, the outer surface of each transmission rod is connected with a sliding seat in a sliding mode, and the front surfaces of the sliding seats are connected to the two sides of the back surface of the sliding frame.

Preferably, the speed reducer body is installed at the top of frame, the carrier is installed to the bottom of joint pole, the inner wall of carrier is provided with supplementary gear assembly, the inside of bracing piece is connected with the linking gear through the mounting, drive gear is installed to the output of speed reducer body, the surface of drive gear, linking gear and supplementary gear assembly all meshes the driving chain, the back of speed reducer body is provided with the control handle.

Preferably, the fixing base is installed at the top of carriage, the fixed plate is installed to the inner wall of fixing base, one side screw thread through connection of fixed plate has the control lead screw, the front end of control lead screw is connected with spacing clamp, the telescopic link is installed to the inboard gomphosis of fixed plate, and the front end of telescopic link is connected in the outside that spacing clamp.

Preferably, the joint board is installed in the front of bracing piece, and the joint board is located the inboard of rotating the seat, the top joint of joint board has the joint groove, the inner wall in joint groove is connected with spacing spring, spacing spring's front end is connected with the grip block.

Preferably, the back surface of the sliding frame is provided with a connecting seat, the front end of the transmission chain is connected to the surface of the connecting seat, and the tail end of the transmission chain is connected to the bottom of the back surface of the sliding frame.

Preferably, the inside joint in joint groove has the gag lever post, the limiting plate is installed at the top of gag lever post, the fender is installed to one side of limiting plate, limit baffle is installed to the inner wall of fender.

Preferably, the bases are installed on two sides of the bottom of the frame, and the limiting pyramid is installed at the bottom of each base.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention adjusts the inclination angle of the device through the arrangement of the frame, the supporting seat, the universal wheel, the throttle control handle, the base and the limiting pyramid, thereby facilitating the integral movement of the device and providing convenience for the use of the device, when in installation and use, the limiting pyramid is spliced with the ground, and the stability of the device in use is added under the auxiliary supporting action of the antiskid seat, thereby facilitating the control action of the throttle control handle on the drilling work of the device, and the stable supporting structure is provided for the use of the device through the matching between the supporting seat and the frame, compared with the traditional manual supporting mode, the invention reduces the unstable factor of manual control, improves the accuracy of the drilling work, reduces the labor intensity, saves time and labor, improves the drilling efficiency of the device, and under the auxiliary action of the telescopic rod, the movable limiting clamp plays a limiting clamping role on the gasoline engine body on the sliding frame, thereby increasing the stability of the device during operation and improving the stability of the device drilling mechanism during operation.

2. The drill bit component is provided with a connecting rod, a connecting pin and a drill bit component, so that the structure is convenient to disassemble, the connecting pin structure is convenient to replace, the efficient connecting effect of the drill bit component is guaranteed, the drill bit component is convenient to replace, the application range of the device is enlarged, the requirements of different drilling work are met, the applicability of the device is enlarged, the structure is convenient to disassemble, clean and maintain, the service life of the device is prolonged, and the cost consumption is reduced.

3. According to the invention, through the arrangement of the sliding frame, the speed reducer body, the driving gear, the transmission chain, the connecting gear, the auxiliary gear assembly, the clamping plate, the limiting rod, the mudguard, the limiting spring and the clamping plate, the sliding frame is driven to slide up and down under the auxiliary action of the transmission rod and the sliding seat, and then the drilling work of the device is matched, the arrangement of the auxiliary gear assembly increases the stability of the movement of the transmission chain, so that the stability of the lifting structure of the drill bit assembly is improved, the limiting clamping is carried out on the limiting rod through the rebound resilience of the limiting spring, so that the inserting stability and the easy disassembly performance of the mudguard are increased, the protection effect on the connecting gear is increased by the installation of the mudguard, the influence of soil carried by the drill bit assembly on the connecting gear is reduced when the device works, and the high efficiency of the work of the device is maintained.

Drawings

FIG. 1 is a perspective view of the structure of the present invention;

FIG. 2 is a schematic view of the fender structure of the present invention;

FIG. 3 is a schematic view of a sliding seat structure according to the present invention;

FIG. 4 is a schematic view of a connecting pin according to the present invention;

FIG. 5 is a schematic cross-sectional view of a drive train structure according to the present invention;

FIG. 6 is a cross-sectional view of the carriage assembly of the present invention;

FIG. 7 is a schematic cross-sectional view of a clamping plate structure according to the present invention;

fig. 8 is a schematic top view of the structure of the limit stop of the present invention.

In the figure: 1. a frame; 2. a gasoline engine body; 3. a carriage; 4. a linking frame; 5. a support bar; 6. a connecting rod; 7. a supporting seat; 8. a universal wheel; 9. an anti-slip seat; 10. a throttle control handle; 11. a connecting rod; 12. a connecting pin; 13. a drill bit assembly; 14. a rotating seat; 15. a transmission rod; 16. a sliding seat; 17. a speed reducer body; 18. an auxiliary gear assembly; 19. engaging the gears; 20. a drive gear; 21. a drive chain; 22. a control grip; 23. a fixed seat; 24. a fixing plate; 25. controlling the screw rod; 26. a limiting clamp; 27. a telescopic rod; 28. a clamping and connecting plate; 29. a limiting spring; 30. a clamping plate; 31. a connecting seat; 32. a limiting rod; 33. a limiting plate; 34. a fender; 35. a limit baffle; 36. a base; 37. limiting pyramid.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows:

referring to fig. 1, 3, 5 and 7, in an embodiment of the present invention, a chain wheel type ground auger with a speed changing structure includes a frame 1, a support seat 7 and universal wheels 8, a sliding frame 3 is disposed on a front surface of the frame 1, a gasoline engine body 2 is mounted on a top of the sliding frame 3, a connecting frame 4 is mounted on a top of an inner wall of the frame 1, a support rod 5 is mounted on a bottom of the inner wall of the frame 1, a connecting rod 6 is mounted on an inner wall of the frame 1, the connecting rod 6 is located above the support rod 5, the support seats 7 are disposed on bottoms of two sides of the frame 1, the universal wheels 8 are connected to an outer side of the support seat 7, an anti-slip seat 9 is mounted at a front end of the support seat 7, an accelerator control handle 10 is disposed on a back surface of the frame 1, a front surface of the accelerator control handle 10 is connected to a surface of the gasoline engine body 2 through a circuit assembly, bases 36 are mounted on two sides of the bottom of the frame 1, the bottom of the base 36 is provided with a limiting pyramid 37, the top of the sliding frame 3 is provided with a fixed seat 23, the inner wall of the fixed seat 23 is provided with a fixed plate 24, one side of the fixed plate 24 is in threaded through connection with a control screw rod 25, the front end of the control screw rod 25 is connected with a limiting clamp 26, the inner side of the fixed plate 24 is embedded with a telescopic rod 27, and the front end of the telescopic rod 27 is connected to the outer side of the limiting clamp 26;

through the arrangement of the frame 1, the supporting seat 7, the universal wheel 8, the throttle control handle 10, the base 36 and the limiting pyramid 37, the inclination angle of the device is adjusted through the throttle control handle 10, so that the integral movement of the device is facilitated, the convenience is provided for the use of the device, in addition, when the device is installed and used, the limiting pyramid 37 is spliced with the ground, in addition, the stability of the device in the use process is added under the auxiliary supporting effect of the anti-skid seat 9, the control effect of the throttle control handle 10 on the drilling work of the device is facilitated, through the matching between the supporting seat 7 and the frame 1, a stable supporting structure is provided for the use of the device, compared with the traditional manual supporting mode, the unstable factor of manual control is reduced, the accuracy of the drilling work is improved, the labor intensity is reduced, time and labor are saved, the drilling efficiency of the device is improved, under the auxiliary effect of the telescopic rod 27, drive the activity of spacing clamp 26 to the activity of accessible spacing clamp 26 plays the effect of spacing centre gripping to gasoline engine body 2 on the carriage 3, thereby adds the stability of its during operation, improves the device and bores the stability of getting the mechanism work.

Example two:

referring to fig. 1, 2 and 4, in an embodiment of the invention, a chain wheel type ground auger with a speed changing structure includes a connecting rod 11, a connecting pin 12 and a drill bit assembly 13, the connecting rod 11 is installed at an output end of a gasoline engine body 2, the connecting pin 12 is sleeved on an outer surface of the connecting rod 11, the drill bit assembly 13 is connected to a bottom of the connecting pin 12, and a fixing bolt is connected to an outer surface thread of the connecting pin 12 in a penetrating manner;

through connecting rod 11, connecting pin 12 and drill bit assembly 13's setting, add the just nature of tearing open between the structure, be convenient for to the change of connecting pin 12 structure to ensure its efficient linking effect, to drill bit assembly 13's convenient change simultaneously, add the application scope of device, satisfy the demand of getting work in the different brills, add the suitability of device, and the just nature of tearing open of structure, also be convenient for get the dismantlement of structure and wash and maintain boring, prolong its life, reduce cost and consume.

Example three:

referring to fig. 1, 5, 6 and 8, in an embodiment of the present invention, a sprocket type ground drill with a speed changing structure includes a sliding frame 3, a speed reducer body 17 and a driving gear 20, a connecting seat 31 is installed on the back surface of the sliding frame 3, the front end of the driving chain 21 is connected to the surface of the connecting seat 31, the tail end of the driving chain 21 is connected to the bottom of the back surface of the sliding frame 3, a rotating seat 14 is installed on the front surfaces of a connecting frame 4 and a connecting rod 6, a driving rod 15 is installed on the inner wall of the rotating seat 14, a sliding seat 16 is slidably connected to the outer surface of the driving rod 15, the front surfaces of the sliding seats 16 are connected to the two sides of the back surface of the sliding frame 3, the speed reducer body 17 is installed on the top of the frame 1, a gear carrier is installed on the bottom of the connecting rod 6, an auxiliary gear assembly 18 is installed on the inner wall of the gear carrier, a connecting gear 19 is connected to the inside of the supporting rod 5 through a fixing member, the output end of the speed reducer body 17 is provided with a driving gear 20, the surfaces of the driving gear 20, the connecting gear 19 and the auxiliary gear assembly 18 are all meshed with a transmission chain 21, the back surface of the speed reducer body 17 is provided with a control handle 22, the front surface of the support rod 5 is provided with a clamping plate 28, the clamping plate 28 is positioned on the inner side of the rotating seat 14, the top of the clamping plate 28 is clamped with a clamping groove, the inside of the clamping groove is clamped with a limiting rod 32, the top of the limiting rod 32 is provided with a limiting plate 33, one side of the limiting plate 33 is provided with a mudguard 34, the inner wall of the mudguard 34 is provided with a limiting baffle 35, the inner wall of the clamping groove is connected with a limiting spring 29, and the front end of the limiting spring 29 is connected with a clamping plate 30;

through the arrangement of the sliding frame 3, the speed reducer body 17, the driving gear 20, the transmission chain 21, the engaging gear 19, the auxiliary gear assembly 18, the clamping plate 28, the limiting rod 32, the mudguard 34, the limiting spring 29 and the clamping plate 30, the driving sliding frame 3 is driven to slide up and down under the auxiliary action of the driving rod 15 and the sliding seat 16, then the drilling work of the device is matched, the stability of the movement of the driving chain 21 is added by the arrangement of the auxiliary gear assembly 18, the stability of the lifting structure of the drill bit assembly 13 is improved, and through the rebound resilience of the limiting spring 29, the limit rod 32 is clamped in a limiting way, so that the inserting stability and the convenience in disassembly of the mudguard 34 are increased, the mudguard 34 is installed to protect the connecting gear 19, the working condition of the device is reduced, the effect of the earth carried by the bit assembly 13 on the engagement gear 19 maintains the efficiency of the operation of the device.

In the invention, the working steps of the device are as follows:

through the collocation work of the frame 1 and the supporting seat 7, when the device is used, the whole device is supported by the frame 1, the supporting seat 7 is provided with the universal wheels 8, the whole mobility of the device is added, the inclination angle of the device can be adjusted by 10 under the control of the accelerator, thereby being convenient for the whole device to move, the convenience is provided for the use of the device, and when the device is installed and used, the whole device can contact the limiting pyramid 37 with the ground through the arrangement of the base 36 and the limiting pyramid 37, the vertical device is integrally connected with the ground, the device is spliced with the ground, under the auxiliary supporting effect of the antiskid seat 9, the stability of the device in use is added, thereby the accelerator is convenient for controlling the control effect of the 10 on the drilling work of the device, through the matching between the supporting seat 7 and the frame 1, a stable supporting structure is provided for the use of the device, and compared with the traditional manual supporting mode, the unstable factor of manual control is reduced, the accuracy of drilling work is improved, the labor intensity is reduced, time and labor are saved, the drilling efficiency of the device is improved, the connecting rod 11 and the connecting pin 12 are arranged, the connecting rod 11 and the connecting pin 12 are installed and connected in an inserting mode, the connecting pin 12 and the drill bit assembly 13 are installed in an inserting mode, and after the connecting rod 11 and the connecting pin 12 are inserted and connected with each other relatively, the connecting pin 12 and the drill bit assembly 13 are connected and fixed through fixing bolts, so that the convenient disassembly performance between the structures is increased, the structure of the connecting pin 12 is conveniently replaced, the efficient connection effect is guaranteed, meanwhile, the drill bit assembly 13 is conveniently replaced, the application range of the device is increased, the drill bit assemblies 13 of different types can be replaced according to the actual drilling condition, the requirements of different drilling works are met, the applicability of the device is increased, and the convenient disassembly performance of the structure is improved, the drilling structure is convenient to disassemble, clean and maintain, the service life of the drilling structure is prolonged, the cost consumption is reduced, through the arrangement of the sliding frame 3 and the speed reducer body 17, the speed reducer body 17 drives the driving gear 20 at the output end to rotate after working, then drives the transmission chain 21 to rotate, drives the connecting gear 19 and the auxiliary gear assembly 18 to rotate respectively under the rotation of the transmission chain 21, and drives the sliding frame 3 connected with the transmission chain 21 to move through the rotation of the driving gear 20 and the connecting gear 19, the limit sliding performance of the sliding frame 3 is added through the cooperation of the transmission rod 15 and the sliding seat 16, so that the sliding frame 3 can be driven to slide up and down under the auxiliary action of the transmission rod 15 and the sliding seat 16 through the movement of the transmission chain 21, the drilling work of the matching device is further carried out, the arrangement of the auxiliary gear assembly 18, and the stability of the movement of the transmission chain 21 is added, then the stability of the lifting structure of the drill bit assembly 13 is improved, the mudguard 34 is inserted into the clamping plate 28 through the arrangement of the limit rod 32 on the back surface of the mudguard, the clamping plate 28 is provided with the limit spring 29 and the clamping plate 30, the limit rod 32 is clamped in a limiting way through the resilience of the limit spring 29, so that the inserting stability of the mudguard 34 is increased, the convenience in disassembly is realized, the protective effect on the connecting gear 19 is increased due to the installation of the mudguard 34, the influence of the soil carried by the drill bit assembly 13 on the connecting gear 19 is reduced during the operation of the device, the high efficiency of the operation of the device is maintained, the lead screw 25 and the limit clamp 26 are controlled through the fixed plate 24, the lead screw 25 is rotatably controlled through the installation of the fixed seat 23 on the sliding frame 3, the activity of the limit clamp 26 is driven under the auxiliary action of the telescopic rod 27, and the activity of the limit clamp 26 can be realized, the gasoline engine body 2 on the sliding frame 3 is clamped in a limiting mode, so that the stability of the gasoline engine body in working is improved, and the working stability of the drilling mechanism of the device is improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a sprocket formula ground bores with variable speed structure, includes frame (1), gasoline engine body (2) and carriage (3), its characterized in that: a sliding frame (3) is arranged on the front surface of the frame (1), and a gasoline engine body (2) is mounted at the top of the sliding frame (3);

the top of the inner wall of the frame (1) is provided with a connecting frame (4), the bottom of the inner wall of the frame (1) is provided with a support rod (5), the inner wall of the frame (1) is provided with a connecting rod (6), and the connecting rod (6) is positioned above the support rod (5);

the bottom of frame (1) both sides is provided with supporting seat (7), the outside of supporting seat (7) is connected with universal wheel (8), antiskid seat (9) are installed to the front end of supporting seat (7), the back of frame (1) is provided with throttle control handle (10), and throttle control handle (10) openly pass through circuit assembly and connect in the surface of gasoline engine body (2).

2. The sprocket wheel type ground auger with a speed changing structure according to claim 1, wherein: connecting rod (11) are installed to the output of gasoline engine body (2), connecting pin (12) have been cup jointed to the surface of connecting rod (11), the bottom of connecting pin (12) is connected with drill bit assembly (13), the surface screw thread through connection of connecting pin (12) has fixing bolt.

3. The sprocket wheel type ground auger with a speed changing structure according to claim 1, wherein: the front of linking up frame (4) and linking pole (6) all installs and rotates seat (14), it installs transfer line (15) to rotate seat (14) inner wall, the surface sliding connection of transfer line (15) has sliding seat (16), and the front of sliding seat (16) is connected in the both sides at carriage (3) back.

4. The sprocket wheel type ground auger with a speed changing structure according to claim 1, wherein: speed reducer body (17) are installed at the top of frame (1), the carrier is installed to the bottom of joint pole (6), the inner wall of carrier is provided with auxiliary gear subassembly (18), the inside of bracing piece (5) is connected with linking gear (19) through the mounting, drive gear (20) are installed to the output of speed reducer body (17), drive gear (20), the surface of linking gear (19) and auxiliary gear subassembly (18) all meshes has drive chain (21), the back of speed reducer body (17) is provided with control handle (22).

5. The sprocket wheel type ground auger with a speed changing structure according to claim 1, wherein: fixing base (23) are installed at the top of carriage (3), fixed plate (24) are installed to the inner wall of fixing base (23), one side screw thread through connection of fixed plate (24) has control lead screw (25), the front end of control lead screw (25) is connected with spacing clamp (26), telescopic link (27) are installed to the inboard gomphosis of fixed plate (24), and the front end of telescopic link (27) is connected in the outside of spacing clamp (26).

6. The sprocket wheel type ground auger with a speed changing structure according to claim 1, wherein: joint board (28) are installed in the front of bracing piece (5), and joint board (28) are located the inboard of rotating seat (14), the top joint of joint board (28) has the joint groove, the inner wall in joint groove is connected with spacing spring (29), the front end of spacing spring (29) is connected with grip block (30).

7. The sprocket wheel type ground auger with a speed changing structure according to claim 1, wherein: the back mounting of carriage (3) has connecting seat (31), and the front end of driving chain (21) is connected in the surface of connecting seat (31), the tail end of driving chain (21) is connected in the bottom at the carriage (3) back.

8. The sprocket wheel type ground auger with a speed changing structure according to claim 6, wherein: the inside joint in joint groove has gag lever post (32), limiting plate (33) are installed at the top of gag lever post (32), fender (34) are installed to one side of limiting plate (33), limit baffle (35) are installed to the inner wall of fender (34).

9. The sprocket wheel type ground auger with a speed changing structure according to claim 1, wherein: base (36) are all installed to the both sides of frame (1) bottom, spacing pyramid (37) are installed to the bottom of base (36).